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Inventories - Continuity of Obsolescence Reserve from Continuing Operations for Inventory (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 25, 2017	Mar. 26, 2016
Inventory Disclosure [Abstract]
Beginning balance	$ 1,332	$ 1,671	$ 2,178
Additional charges	592	300	533
Deductions	(436)	(639)	(1,040)
Ending balance	$ 1,488	$ 1,332	$ 1,671

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- Definition

Additional Charges Of Obsolescence Reserve For Inventory

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No definition available.

+ Details

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Balance Type:	debit
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- Definition

Deductions Of Obsolescence Reserve For Inventory

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No definition available.

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- Definition

Inventory Obsolescence

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No definition available.

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Name:	bgi_InventoryObsolescence
Namespace Prefix:	bgi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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